Fix publishing jobs

It was incorrectly assumed that the PyPI publish GitHub Action was
building the Python package before uploading it.

Author: SkypLabs

.github/workflows/test_and_publish.yml

@@ -94,6 +94,19 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v3
 
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade build setuptools wheel
+
+      - name: Build Python package
+        run: python -m build
+
       - name: Publish to TestPyPI
         uses: pypa/gh-action-pypi-publish@v1.8.10
         with:
@@ -119,6 +132,19 @@ jobs:
       - name: Check out code
         uses: actions/checkout@v3
 
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install --upgrade build setuptools wheel
+
+      - name: Build Python package
+        run: python -m build
+
       - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@v1.8.10
         with: